Lamp.



H. A. WILLIAMSON.

LAMP.

APPLlA'TloN FxLED 1AN.28. 1914. Rem-:wan MAR. 18,1916.

' 1,1 WM... Patented Apr. 25,1916.

HENRY A.. WILLIAMSON, 0F GHCAGO. XLLNOIS.

LAMP.

Meritis. y

Specification .of Letters Patent.

Patented Apr. 25, Nitti?.

Application filed January 2S, 19141 Serial Nov 8144MB. Renewedv March18, 1916. Serial No. $55,199.i

here invented n cel'tnin new und useful Im provenient in Lamps. nuddechire the .follon'ingto loe n full. clear`l n-nd exact description ot'the sinne. such :is will cnnhle others skilled iu the mit to which itpertains to mirko und use the sinne, re terence heiner had to thencconlpnnyiner drawings, which forni n pnrt of this specification.

My invention hns for its object to produce a, lmnp by inenns of whichthe direction of the rays ot light muy hc determined nt will the eyeseven though n powerful light be used.

The various tentures ot' novelty whereby my invention 'is clmrncterizedn'ill hereinnt ter he pointed out with pin'ticulnrity in the claims; hutfor n `l'ull unilerstnnding ol my invention und olf its object und:ulrnntnges, reference. may he hud to the following' detnileddescription tuken in connection with they accompanying drawing.-ohci-ein:

Figure .l is n centrnl longitudinnl section through nn nu 'tmobile lumpembodying my im'entiion; Fig. 2 n tront i'ien ot the lmnp; sind Fig. Sis u section token on line 3H?, of Fig. l.

Generally spenkine, my intention conin the use of n plurnlity ol lenssections or segments 'provided with prismutic rihs, und n similarninnlier of reflectors zich ndnpted to reflect :i pretlelermined portionof light troni the source. through oncol the lens sections orsegn'ients.

vln-the drawings ,l hure illustrnted my invention in its simplest torniund, For the stilte ot brevity. l shnll confine the detailed descriptionto this one torni.

Referring` to the drawing'. 'l representsV :t lensing open :it the'front nud hnring in the roer end thereof :it suitnnle lmnp or othersource ot' illni-nimition. 'lhe Front olI the casing' is closed by menneuit n lens nnide of :i plurality ot sectiws. in 'the' present nrurangement the leus is innde ot' eight sections each having nn unfgularwidth or' 'forty-tive degrees so that when placed together they form a,complete disk. The sections are indicated. by the reference character 3.Esch .Section is provided with prisnnitie ribs,

extending transversely to rthe rndinl axis; the arrangement being suchthat when. the

several sections Ynre assembled together the ribs thereon torni :iseries oit concentric ooi' tngons extending' from the center to thepcriphervy reniently he held together by plncing them between tivo disksof plain glass, 5 and 6.

Behind the lamp is arranged :i reector, 7, in the torni ol e truncatedpyramid having ns many sides ns there are lens sections and so disposedthat. each side lies-directly he# hind one of the lens sections. Withthis :irrnnsjeinent, each lens section receives light from :L tint;retlec or portion., so' that the light. is unil1 ormly di. rihuted und,in passing through the lens, is positively directed, sind there being;nl; the same time suftieient diffusion to prevent an objectionable glareand prevent the-light from being dazzling no mutter from what point itis viewedrnnd eren. thonghthe source ot light be a poivrerful one. i

While l have illustrated and described with pnrtieulnrity only n singlepreferred :form of my intention, l. do not desire to be limited to theexact structural details thus illustrated und described, ont intend tocover sill forms and arrangements which come within the terms employedin the definitions ot my invention constituting the appended clnims.

.l v claim:

l. ln n lamp, n flens composed of e plurality ot segments each providedwith prisf mntie ribs arranged transverse to the redini. axis thereof, nreflector mode of segments corresponding; nnniher to the number of lenssegments and ench segment of" the reflector being.;1 disposed directlyhehind one O the lens'sefnuents, und u lioht dis osecl loein n lamp, n.plurality of lens members provided with 'prisrnatie ribs, e reflectorhaving e plurality of sections corresponding in number to the lensmembers nndjettch zu ranged directly behind one of the lens mem- Theseveral sections may C0n' bers, and a source of light disposed between`the'relleotor and the lens members.

' In a lamp, a lens composed of n plurality .of segments arranged edgeto edge vbeing provided. with prismntie ribs extendlng transversely toits radial axis, plain glass disks lying on opposite sides of the lenssegments for holding the seglnents together, :i reflector in the forniof :i truncated py1'n1nid\\`.ose sides are equal in number to the numberof lens segments,` each side of the reflector lying directly behind'oneof the` lens segments, und a. source ol l1gl1t between the refiector andthe lens.

In testimonyA whereof, I sign this specifi- Galion in the presence oftwo witnesses.

HENRY A. WILLIAMSON. lVitnesses WVM. F. FRnUDnNnnrCi-r, RUTH E.ZETTERVALL.

